Method for extracting rubidium chloride from rubidium-containing high-salt brine

A rubidium chloride and brine technology, applied in chemical instruments and methods, rubidium/cesium/francium compounds, inorganic chemistry, etc., can solve the problems of volume increase, increase the cost of recovering other salts in salt brine, etc., and reduce the cost of follow-up treatment Effect
CN112239221AActive Publication Date: 2021-01-19INST OF RESOURCES COMPREHENSIVE UTILIZATION GUANGDONG ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
INST OF RESOURCES COMPREHENSIVE UTILIZATION GUANGDONG ACAD OF SCI
Publication Date
2021-01-19

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Abstract

The invention relates to the technical field of rubidium separation and purification, and particularly discloses a method for extracting rubidium chloride from rubidium-containing high-salt brine. Themethod comprises the following steps: firstly, adding inorganic alkali into rubidium-containing high-salt brine in stages to precipitate metal ion impurities such as copper, lead, zinc and magnesiumin the rubidium-containing high-salt brine, and adjusting the pH value of the high-salt brine to 13-14; and then, carrying out multistage extraction-washing-reverse extraction treatment on the high-salt brine by using 4-tert-butyl-2-(alpha-methyl benzyl) phenol as an extracting agent and sulfonated kerosene as a diluent to obtain a reverse extraction solution containing rubidium chloride, and carrying out precipitation, calcination and re-crystallization treatment on the reverse extraction solution to obtain a high-purity rubidium chloride product. Tests prove that rubidium can be extracted and purified from rubidium-containing high-salt brine by the method, and the volume of raffinate in the extraction process is not increased on the premise of ensuring the rubidium separation effect andrecovery rate, so that the subsequent treatment cost of the brine is reduced.
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Description

technical field

[0001] The invention relates to the technical field of separation and purification of rubidium, in particular to a method for extracting rubidium chloride from high-salt brine containing rubidium. Background technique

[0002] Rubidium is a rare alkali metal element widely used in optical glass, thermoelectric generators, atomic clocks, solar cells, medicine and other fields. The content of rubidium in the earth's crust is about 0.028%, which is not low but extremely scattered. So far, no pure rubidium mineral has been found, but exists in other minerals such as mica, cesium garnet, and halides containing cesium, lithium, and potassium. Therefore, it can only be extracted as a by-product, resulting in its scarcity.

[0003] The separation and purification of rubidium is a challenging task, because the associated alkali metal elements have very similar physical and chemical properties. The earliest in the prior art is to use the chloroplatinic acid precipita...

Claims

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